泔水游离脂肪酸甘油酯化制备生物柴油。
Glycerin esterification of scum derived free fatty acids for biodiesel production.
机构信息
Department of Bioproducts and Biosystems Engineering, and Center for Biorefining, University of Minnesota, 1390 Eckles Avenue, St. Paul, MN 55108, USA.
Department of Bioproducts and Biosystems Engineering, and Center for Biorefining, University of Minnesota, 1390 Eckles Avenue, St. Paul, MN 55108, USA.
出版信息
Bioresour Technol. 2016 Jan;200:153-60. doi: 10.1016/j.biortech.2015.10.018. Epub 2015 Oct 19.
Scum is an oily waste stream of the wastewater treatment process that can be used to produce biodiesel. Combining acid hydrolysis and solvent extraction, a free fatty acid and acyl-glycerol rich product was produced. Free fatty acids (FFAs) present were converted to acyl-glycols via a high temperature (238°C) glycerin esterification process known as glycerolysis. The inorganic catalysts zinc aluminum oxide and sodium sulfate were tested during glycerolysis to compare the reaction kinetics of converting FFA to acyl-glycerols. It was concluded that the zinc-based catalyst increased the reaction rate significantly, from a "k" value of 2.57 (uncatalyzed) to 5.63, completing the reaction in 60min, half the time it took the uncatalyzed reaction (120min). Sodium sulfate's presence however slowed the reaction, resulting in a "k" value of 1.45, completing the reaction in 180min. Use of the external catalyst Zn-Al2O3 showed the greatest catalytic potential, but also assumes additional costs.
浮渣是废水处理过程中的一种含油废水，可以用来生产生物柴油。通过酸水解和溶剂萃取相结合，生产出富含游离脂肪酸和酰基甘油的产品。存在的游离脂肪酸（FFAs）通过称为甘油解的高温（238°C）甘油酯化过程转化为酰基甘油。在甘油解过程中测试了无机催化剂氧化锌和硫酸钠，以比较将 FFAs 转化为酰基甘油的反应动力学。结果表明，锌基催化剂显著提高了反应速率，从无催化剂的“k”值 2.57 增加到 5.63，在 60 分钟内完成反应，而无催化剂的反应需要 120 分钟（完成反应所需时间的一半）。然而，硫酸钠的存在会减缓反应，导致“k”值为 1.45，反应在 180 分钟内完成。使用外部催化剂 Zn-Al2O3 显示出最大的催化潜力，但也假设了额外的成本。
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